Question

Log1/2(7x-21)>log1/2 6x

Answer 1

$log_{ \frac{1}{2}} (7x-21)\ \textgreater \ log_{ \frac{1}{2}}(6x)$
x∈(3,+∞)
$7x-21\ \textless \ 6x$
$7x-6x\ \textless \ 21$
$x\ \textless \ 21$, x∈(3,+∞)
Ответ: (3,21)